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jamod is an object oriented implementation of the Modbus protocol, realized 100% in Java. It allows to quickly realize master and slave applications in various transport flavors (IP and serial).

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/***
 * Copyright 2002-2010 jamod development team
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ***/

package net.wimpi.modbus.cmd;

import net.wimpi.modbus.ModbusCoupler;
import net.wimpi.modbus.Modbus;
import net.wimpi.modbus.net.ModbusUDPListener;
import net.wimpi.modbus.procimg.SimpleDigitalIn;
import net.wimpi.modbus.procimg.SimpleDigitalOut;
import net.wimpi.modbus.procimg.SimpleInputRegister;
import net.wimpi.modbus.procimg.SimpleProcessImage;
import net.wimpi.modbus.procimg.SimpleRegister;

/**
 * Class implementing a simple Modbus/UDP slave.
 * A simple process image is available to test
 * functionality and behaviour of the implementation.
 *
 * @author Dieter Wimberger
 * @version 1.2 (@date@)
 */
public class UDPSlaveTest {

  public static void main(String[] args) {

    ModbusUDPListener listener = null;
    SimpleProcessImage spi = null;
    int port = Modbus.DEFAULT_PORT;

    try {

      if(args != null && args.length ==1) {
        port = Integer.parseInt(args[0]);
      }

      System.out.println("jModbus Modbus/UDP Slave v0.1");

      //1. Prepare a process image
      spi = new SimpleProcessImage();
      spi.addDigitalOut(new SimpleDigitalOut(true));
      spi.addDigitalIn(new SimpleDigitalIn(false));
      spi.addDigitalIn(new SimpleDigitalIn(true));
      spi.addDigitalIn(new SimpleDigitalIn(false));
      spi.addDigitalIn(new SimpleDigitalIn(true));
      spi.addRegister(new SimpleRegister(251));
      spi.addInputRegister(new SimpleInputRegister(45));
      ModbusCoupler.getReference().setProcessImage(spi);
      ModbusCoupler.getReference().setMaster(false);
      ModbusCoupler.getReference().setUnitID(15);

      //2. Setup and start listener
      listener = new ModbusUDPListener();
      listener.setPort(port);
      listener.start();

    } catch (Exception ex) {
      ex.printStackTrace();
    }

  }//main

}//class UDPSlaveTest